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| author | Trond Myklebust <trondmy@gmail.com> | 2019-01-03 09:17:12 -0500 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2019-02-06 15:37:14 -0500 |
| commit | 1602a7b7d33741d0490682e620bb29e96ad684d7 (patch) | |
| tree | 28331ddd85596bfb631950c5ad51c602a946f0c4 /net | |
| parent | 1c3da4452d185e4be663e76a1b9842184d8f9c4c (diff) | |
| download | linux-0-day-1602a7b7d33741d0490682e620bb29e96ad684d7.tar.gz linux-0-day-1602a7b7d33741d0490682e620bb29e96ad684d7.tar.xz | |
SUNRPC: Don't allow compiler optimisation of svc_xprt_release_slot()
Use READ_ONCE() to tell the compiler to not optimse away the read of
xprt->xpt_flags in svc_xprt_release_slot().
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sunrpc/svc_xprt.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c index 4eb8fbf2508dc..c3af1aaef551a 100644 --- a/net/sunrpc/svc_xprt.c +++ b/net/sunrpc/svc_xprt.c @@ -363,9 +363,13 @@ static void svc_xprt_release_slot(struct svc_rqst *rqstp) static bool svc_xprt_has_something_to_do(struct svc_xprt *xprt) { - if (xprt->xpt_flags & ((1<<XPT_CONN)|(1<<XPT_CLOSE))) + unsigned long xpt_flags; + + xpt_flags = READ_ONCE(xprt->xpt_flags); + + if (xpt_flags & (BIT(XPT_CONN) | BIT(XPT_CLOSE))) return true; - if (xprt->xpt_flags & ((1<<XPT_DATA)|(1<<XPT_DEFERRED))) { + if (xpt_flags & (BIT(XPT_DATA) | BIT(XPT_DEFERRED))) { if (xprt->xpt_ops->xpo_has_wspace(xprt) && svc_xprt_slots_in_range(xprt)) return true; |